Denial (8)
'denial' is the definition.
(I know that negative is a type of denial)
This is all the clue.
(Other definitions for negative that I've seen before include "Reversed-colours photo" , "'Pessimistic, gloomy (8)'" , "Piece of photographic film" , "Film showing black and white tones reversed" , "The photographic film expresses refusal" .)
'denial' is the definition.
(I know that refusal is a type of denial)
This is all the clue.
(Other definitions for refusal that I've seen before include "Chance to decline" , "Instance of a horse not jumping" , "Dissent" , "Seal fur (anag.)" , "Horse's action in declining to jump a fence" .)